#include <stdio.h> 
#include <stdlib.h> 

int __attribute__((const))fun (int num)  {
    printf("fun:%s line:%d\n", __func__, __LINE__);
    return num + 1;
}

int main(int argc, char **argv) {
    printf("%d\n", fun(10));
    printf("%d\n", fun(10));
    printf("%d\n", fun(10));
    printf("%d\n", fun(10));
    return 0;
}
